# US 2018/0324689 A1 · Group common pdcch design in nr

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- Number: US 2018/0324689 A1
- Document ID: US20180324689A1
- Status: Published application
- Kind: A1
- Application number: 15/971,123
- Filed: 2018-05-04
- Published: 2018-11-08
- Earliest claimed: 2017-05-05
- Assignees: Mediatek Inc.
- Applicants: Mediatek Inc.
- Inventors: Chien-Chang Li; Yiju Liao; Chien Hwa Hwang; Pei-Kai Liao
- Web page: https://patentgrep.com/patent/US20180324689A1

## CPC

- H04W 48/16: Discovering, processing access restriction or access information
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 27/2602: {Signal structure}
- H04W 52/14: Separate analysis of uplink or downlink
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/121: for groups of terminals or users
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 25/0224: {using sounding signals}
- H04L 27/26: Systems using multi-frequency codes (H04L27/32 takes precedence)
- H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports}
- H04W 52/146: {Uplink power control}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a user equipment (UE). The UE receives symbols in a first time slot. The first time slot includes a control region and a data region. The UE attempts to detect, when the UE is configured to detect, a group common downlink control channel carried by the received symbols. The group common downlink control channel contains common information directed to a group of UEs including the UE. When the detection is successful, the UE determines, based on the common information, at least one of (a) a first slot configuration, (b) a puncture configuration, (c) a transmission burst duration, and (d) one or more sub-regions of the control region.

## Claims

### Claim 1

A method of wireless communication of a user equipment (UE), comprising:
receiving symbols in a first time slot, the first time slot including a control region and a data region;
attempting to detect, when the UE is configured to detect, a group common downlink control channel carried by the received symbols, the group common downlink control channel containing common information directed to a group of UEs including the UE; and
when the detection is successful, determining, based on the common information, at least one of
(a) a first slot configuration of one or more time slots,
(b) a puncture configuration indicating one or more punctured symbols received in a second time slot, the one or more punctured symbols being initially allocated for carrying enhanced Mobile Broadband (eMBB) data and carrying Ultra-Reliable and Low Latency Communications (URLLC) data, the second time slot being prior to the first time slot,
(c) a transmission burst duration of a transmission on an unlicensed link, the unlicensed link being in an unlicensed spectrum, and
(d) one or more sub-regions of the control region containing one or more of the received symbols that are a part of a downlink data channel, the downlink data channel including one or more of the received symbols in the data region.

### Claim 2 (depends on 1)

The method of claim 1, wherein the first slot configuration is determined based on the common information, the method further comprising: determining that each of the one or more time slots is an uplink time slot, a downlink time slot, an uplink priority bi-directional time slot, or a downlink priority bi-directional time slot based on the first slot configuration.

### Claim 3 (depends on 2)

The method of claim 2, further comprising:
determining, based on the first slot configuration, that a third time slot of the one or more time slots is changed, from a downlink time slot, to an uplink time slot allocated to another UE of the group of UEs; and
at least one of:
refraining from decoding a UE specific downlink control channel of the third time slot;
refraining from conducting a radio resource management (RRM) measurement in the third time slot; and
refraining from conducting a channel state information (CSI) measurement in the third time slot.

### Claim 4 (depends on 2)

The method of claim 2, further comprising:
performing a first channel-state information measurement in time slots of the one or more time slots that are designated for downlink time slots semi-statically; and
performing a second channel-state information measurement in time slots of the one or more time slots that are designated for downlink time slots dynamically in accordance with the first slot configuration.

### Claim 5 (depends on 2)

The method of claim 2, further comprising:
performing a first power control in time slots of the one or more time slots that are designated for uplink time slots semi-statically; and
performing a second power control in time slots of the one or more time slots that are designated for uplink time slots dynamically in accordance with the first slot configuration.

### Claim 6 (depends on 2)

The method of claim 2, further comprising:
determining a detection period in each time slot of the one or more time slots based on whether the each time slot is an uplink time slot, a downlink time slot, an uplink priority bi-directional time slot, or a downlink priority bi-directional time slot, the detection period being designated for performing an energy detection for clear channel assessment (CCA).

### Claim 7 (depends on 6)

The method of claim 6, further comprising:
determining a symbol period in the detection period based on whether the each time slot is an uplink time slot, a downlink time slot, an uplink priority bi-directional time slot, or a downlink priority bi-directional time slot, the symbol period being designated for transmitting a predetermined tone used for CCA.

### Claim 8 (depends on 6)

The method of claim 6, further comprising:
determining an energy detection threshold used for CCA based on whether the each time slot is an uplink time slot, a downlink time slot, an uplink priority bi-directional time slot, or a downlink priority bi-directional time slot.

### Claim 9 (depends on 2)

The method of claim 2, further comprising:
determining a gap period in the first time slot based on the first slot configuration.

### Claim 10 (depends on 1)

The method of claim 1, wherein the transmission burst duration is determined based on the common information, the method further comprising:
detecting a start of a downlink transmission on the unlicensed link;
determining that a particular time slot is within the transmission burst duration from the start; and
demodulating symbols received in the particular time slot.

### Claim 11 (depends on 10)

The method of claim 10, further comprising:
selecting a time point within the transmission burst duration from the start;
performing, at the time point, a Listen-Before-Talk (LBT) operation without random backoff; and
transmitting data in an uplink on the unlicensed link when the unlicensed link is determined to be clear by the LBT operation.

### Claim 12 (depends on 1)

The method of claim 1, wherein the puncture configuration is determined based on the common information, the method further comprising:
determining that data carried by one or more symbols in the second time slot were not successfully decoded; and
decoding data carried by symbols other than the punctured symbols in the second time slot again or sending a negative acknowledgement.

### Claim 13 (depends on 1)

The method of claim 1, when the detection is unsuccessful, decoding UE specific downlink control channel in each of the first time slot and subsequent time slots until successfully detecting a group common downlink control channel in a time slot.

### Claim 14 (depends on 1)

The method of claim 1, further comprising:
when the UE is not configured to detect the group common downlink control channel,
determining whether a second slot configuration of the one or more time slots is received from a layer above a physical layer; and
when the second slot configuration is received, determining each of the one or more time slots is an uplink time slot or a downlink time slot based on the second slot configuration and decoding a UE specific downlink control channel in the each time slot determined to be a downlink time slot.

### Claim 15 (depends on 14)

The method of claim 14, further comprising:
decoding a UE specific downlink control channel in each of the one or more time slots when the second slot configuration is received; and
determining the each time slot is an uplink time slot or a downlink time slot based on the decoded UE specific downlink control channel of the each time slot.

### Claim 16

A user equipment (UE) of a wireless communication system, comprising:
a memory; and
at least one processor coupled to the memory and configured to:
receive symbols in a first time slot, the first time slot including a control region and a data region;
attempt to detect, when the UE is configured to detect, a group common downlink control channel carried by the received symbols, the group common downlink control channel containing common information directed to a group of UEs including the UE; and
when the detection is successful, determine, based on the common information, at least one of
(a) a first slot configuration of one or more time slots,
(b) a puncture configuration indicating one or more punctured symbols received in a second time slot, the one or more punctured symbols being initially allocated for carrying enhanced Mobile Broadband (eMBB) data and carrying Ultra-Reliable and Low Latency Communications (URLLC) data, the second time slot being prior to the first time slot,
(c) a transmission burst duration of a transmission on an unlicensed link, the unlicensed link being in an unlicensed spectrum, and
(d) one or more sub-regions of the control region containing one or more of the received symbols that are a part of a downlink data channel, the downlink data channel including one or more of the received symbols in the data region.

### Claim 17 (depends on 16)

The UE of claim 16, wherein the first slot configuration is determined based on the common information, and the at least one processor is further configured to determine that each of the one or more time slots is an uplink time slot, a downlink, an uplink priority bi-directional time slot, or a downlink priority bi-directional time slot time slot based on the first slot configuration.

### Claim 18 (depends on 16)

The UE of claim 16, wherein the at least one processor is further configured to:
determine, based on the first slot configuration, that a third time slot of the one or more time slots is changed, from a downlink time slot, to an uplink time slot allocated to another UE of the group of UEs; and
at least one of:
refrain from decoding a UE specific downlink control channel of the third time slot;
refrain from conducting a radio resource management (RRM) measurement in the third time slot; and
refrain from conducting a channel state information (CSI) measurement in the third time slot.

### Claim 19 (depends on 16)

The UE of claim 16, wherein when the UE is not configured to detect the group common downlink control channel, the at least one processor is further configured to:
determine whether a second slot configuration of the one or more time slots is received from a layer above a physical layer; and
when the second slot configuration is received, the at least one processor is further configured to determine each of the one or more time slots is an uplink time slot or a downlink time slot based on the second slot configuration and decode a UE specific downlink control channel in the each time slot determined to be a downlink time slot.

### Claim 20

A computer-readable medium storing computer executable code for a wireless communication system including a user equipment (UE), comprising code to:
receive symbols in a first time slot, the first time slot including a control region and a data region;
attempt to detect, when the UE is configured to detect, a group common downlink control channel carried by the received symbols, the group common downlink control channel containing common information directed to a group of UEs including the UE; and
when the detection is successful, determine, based on the common information, at least one of
(a) a first slot configuration of one or more time slots,
(b) a puncture configuration indicating one or more punctured symbols received in a second time slot, the one or more punctured symbols being initially allocated for carrying enhanced Mobile Broadband (eMBB) data and carrying Ultra-Reliable and Low Latency Communications (URLLC) data, the second time slot being prior to the first time slot,
(c) a transmission burst duration of a transmission on an unlicensed link, the unlicensed link being in an unlicensed spectrum, and
(d) one or more sub-regions of the control region containing one or more of the received symbols that are a part of a downlink data channel, the downlink data channel including one or more of the received symbols in the data region.